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And not just Iray specifically
In every online vs offline render the intensity of highlight spot is so different with every setting being perfectly same. Looks totally same in Evee vs Cycles comparison and so on.
For example random Megascan texture asphalt roughness looks perfectly fine in Cycles . But for a game you usually have to darken the roughness quite a bit . Otherwize the asphalt would be totally matte.
In a game I see no asphalt shine at all when the sun goes 50 degree and higher . In real life and Iray or Cycles or Octane , Arnold it's just like in real life. Even when the sun is as high as 70 degree you still see a bit of it. At low sun angles it's other way around. That very same asphalt shines like crazy in game renders and ok in offline ones.
That thing have been bothering me for a decade already. Isn't it an energy conservation issue? The intensity of highlight spot including not so polished materials and in any PBR should be looking more or less same , not so drastically different in game renders. What's the purpose of doing accurate true roughness values if it looks so different?
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